Firebrick of alumina heat insolation can use as the working layer that contacts blaze directly or use as thermal insulation. Porcelain of wide application Yu Tao, fireproof material is firing component of sintering furnace of kiln, pulverous metallurgy, semiconductor is firing kiln and have nitrogenWait with the kiln furnace of reductive nitrogen.
Alumina is hollow ball brick is fireproof degree be more than 2400 ℃ , apparent pore rate is 55%-60% , bulk density is 2.5-3.0g/cm3, compression intensity is not less than 4.9MPa, rate of hot heat conduction is 0.23-0.35W/ (M · K) .
Alumina is hollow the making method of ball brick is, add alumina raw material dump type liquid state melts inside electric stove, next furnace dump proper point of view, make solution from irrigate makings chamfer to be poured out of with fixed rate, make currentCourse and stream into 60 ℃ - the high speed air current that the sector spray head of 90 ℃ is 0.6-0.8MPa with pressure blows current medicinal powder. Compositive alumina is hollow ball, next alumina hollow ball, agglomeration alumina is fine pink and feltThe agent presses certain proportion burden, shape, dry, firing, make alumina is hollow ball brick.
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